PLEASE Help. Green Screen in Video Playback and all Video Files.

Hello to who ever can help a hand out. I feel very stressed by this whole problem. I have a documentary movie that has been finished and edited. I only had to add a couple more parts to it to finalize the film. However when i went on my computer today, (last time being last week. Where everything had worked properly) all the video playback is green. it has audio of all the video files, but the video shows up green in the playback and the viewer. Any idea what could have happened. (last week i added a 5 jpegs thats it!)

Please anybody with any suggestions, I would be very greateful.